Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory. This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using non-photosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont, a cell living within another cell. Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts.
—from Campbell Biology AP Edition, a book by Campbell
Active since October 7, 2017.
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| Rank | Username | WPM | Accuracy | Date |
|---|---|---|---|---|
| 1886. | Rjnal (rjnal) | 58.85 | 96% | 2020-03-07 |
| 1887. | Travis (daltrav1) | 58.84 | 96% | 2017-10-23 |
| 1888. | Neodymium (neodytrium) | 58.82 | 94% | 2020-07-06 |
| 1889. | Cobra (cobra03) | 58.70 | 96% | 2020-06-07 |
| 1890. | Tushar (tushar_1997) | 58.66 | 95% | 2018-04-19 |
| 1891. | jjpjimmy (jjpjimmy) | 58.57 | 95% | 2019-09-27 |
| 1892. | Collin (cdog707yo) | 58.53 | 95% | 2018-02-21 |
| 1893. | beFriend💚 (s1l3n7) | 58.49 | 95% | 2018-01-05 |
| 1894. | Erwin (oldskoollogik) | 58.34 | 96% | 2019-03-16 |
| 1895. | Tan (yellofello) | 58.32 | 95% | 2020-05-13 |
| 1896. | HO (hyuanhua) | 58.30 | 97% | 2020-05-05 |
| 1897. | Eckhardt (hummlemuffin) | 58.28 | 94% | 2018-03-20 |
| 1898. | Atif (pakistan_786) | 58.15 | 97% | 2019-12-16 |
| 1899. | Paulo (jimmyskull) | 58.08 | 95% | 2018-10-28 |
| 1900. | oscar (oscarhinxdd) | 58.05 | 98% | 2020-12-01 |
| 1901. | Gabazh (gabazh) | 57.90 | 96% | 2020-07-06 |
| 1902. | Nurbek (tsukerk1) | 57.88 | 94% | 2020-10-27 |
| 1903. | Cooper (cooperbowman21) | 57.73 | 95% | 2018-05-24 |
| 1904. | vetus (vetus) | 57.70 | 96% | 2020-09-06 |
| 1905. | Huhuhn (huhuhn) | 57.67 | 97% | 2019-06-20 |
| 1906. | emily (emilyrs) | 57.58 | 93% | 2020-05-17 |
| 1907. | n00b (gimape07) | 57.50 | 94% | 2019-12-20 |
| 1908. | ApSad (apaars) | 57.49 | 95% | 2018-09-22 |
| 1909. | Chicken (chickenpowerftw) | 57.35 | 94% | 2020-01-13 |
| 1910. | Jefferson (rasmus06) | 57.30 | 96% | 2019-09-24 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
| New English Texts | 1 | 108.31 | May 26, 2022 |